It will be air pressure (long drawn out explanation.. but you dont need it). You are near sea level, so stock you will only reach 10 or 11 psi without hitting fuel cut. I believe the only way you can get past it is with the Lexus AFM modification (at least thats the one I am always told). To do it properly you should do that anyway along with 550 cc injectors although I dont think you need an upgraded fuel pump (not certain with 550's.. I think you are still good stock providing your not exceeding 12 psi).
Its a juggilng game and I still havent quite got mine totally mapped out. but thats the fun part.
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